Ruby On Rails 4 hello world,Ruby On Rails上手

有机会再试一试Rails了，只是原来接触的是2，现在已然变成了4，似乎现在的安装比原来会快些。。

Rails 4 安装

针对于安装了RVM

 gem install rails

没有的话应该主

sudo gem install rails

安装RVM可以用

 \curl -L https://get.rvm.io | bash -s stable

查看rails版本

 rails -v

Rails 4.0.3

似乎这就是当前的最新版本

Ruby版本

We recommend Ruby 2.1.0 for use with Rails. We stopped supporting Ruby 1.8.x after Rails 3.2. Ruby 1.9.2+ will be supported until Rails 5.

官方推荐用2.1.0. 也就是最新版本

安装SQLite

似乎这就是诸如Django、Rails这类对于轻量级网站的数据库要求。

如果是mac os

 brew install sqlite3

其他可以看情况安装，如openSUSE

 sudo zypper install sqlite3

Rails 4 Hello,World

可以直接用rails生成

$rails new hello

于是就有了

  createcreate  README.rdoccreate  Rakefilecreate  config.rucreate  .gitignorecreate  Gemfilecreate  appcreate  app/assets/javascripts/application.jscreate  app/assets/stylesheets/application.csscreate  app/controllers/application_controller.rbcreate  app/helpers/application_helper.rbcreate  app/views/layouts/application.html.erbcreate  app/assets/images/.keepcreate  app/mailers/.keepcreate  app/models/.keepcreate  app/controllers/concerns/.keepcreate  app/models/concerns/.keepcreate  bincreate  bin/bundlecreate  bin/railscreate  bin/rakecreate  configcreate  config/routes.rbcreate  config/application.rbcreate  config/environment.rbcreate  config/environmentscreate  config/environments/development.rbcreate  config/environments/production.rbcreate  config/environments/test.rbcreate  config/initializerscreate  config/initializers/backtrace_silencers.rbcreate  config/initializers/filter_parameter_logging.rbcreate  config/initializers/inflections.rbcreate  config/initializers/mime_types.rbcreate  config/initializers/secret_token.rbcreate  config/initializers/session_store.rbcreate  config/initializers/wrap_parameters.rbcreate  config/localescreate  config/locales/en.ymlcreate  config/boot.rbcreate  config/database.ymlcreate  dbcreate  db/seeds.rbcreate  libcreate  lib/taskscreate  lib/tasks/.keepcreate  lib/assetscreate  lib/assets/.keepcreate  logcreate  log/.keepcreate  publiccreate  public/404.htmlcreate  public/422.htmlcreate  public/500.htmlcreate  public/favicon.icocreate  public/robots.txtcreate  test/fixturescreate  test/fixtures/.keepcreate  test/controllerscreate  test/controllers/.keepcreate  test/mailerscreate  test/mailers/.keepcreate  test/modelscreate  test/models/.keepcreate  test/helperscreate  test/helpers/.keepcreate  test/integrationcreate  test/integration/.keepcreate  test/test_helper.rbcreate  tmp/cachecreate  tmp/cache/assetscreate  vendor/assets/javascriptscreate  vendor/assets/javascripts/.keepcreate  vendor/assets/stylesheetscreate  vendor/assets/stylesheets/.keeprun  bundle install

接着会安装包依赖

  Fetching gem metadata from https://rubygems.org/..........Fetching additional metadata from https://rubygems.org/..Resolving dependencies...Using rake (10.3.1)Using i18n (0.6.9)Using minitest (4.7.5)Using multi_json (1.9.2)Using thread_safe (0.3.3)Using tzinfo (0.3.39)Using activesupport (4.0.3)Using builder (3.1.4)Using erubis (2.7.0)Using rack (1.5.2)Using rack-test (0.6.2)Using actionpack (4.0.3)Using mime-types (1.25.1)Using polyglot (0.3.4)Using treetop (1.4.15)Using mail (2.5.4)Using actionmailer (4.0.3)Using activemodel (4.0.3)Using activerecord-deprecated_finders (1.0.3)Using arel (4.0.2)Using activerecord (4.0.3)Using bundler (1.5.3)Using coffee-script-source (1.7.0)Using execjs (2.0.2)Using coffee-script (2.2.0)Using thor (0.19.1)Using railties (4.0.3)Using coffee-rails (4.0.1)Using hike (1.2.3)Using jbuilder (1.5.3)Using jquery-rails (3.1.0)Using json (1.8.1)Using tilt (1.4.1)Using sprockets (2.11.0)Using sprockets-rails (2.0.1)Using rails (4.0.3)Using rdoc (4.1.1)Using sass (3.2.19)Using sass-rails (4.0.3)Using sdoc (0.4.0)Using sqlite3 (1.3.9)Using turbolinks (2.2.2)Using uglifier (2.5.0)Your bundle is complete!Use `bundle show [gemname]` to see where a bundled gem is installed.

运行Rails

 $rails server

这样的话打开 http://localhost:3000 就可以看到,Rails的欢迎界面Welcome aboard，有点类似于Django-CMS的小马哥~~

创建controller

如官方指南所说http://guides.rubyonrails.org/getting_started.html

执行命令

$rails generate controller welcome index

就会创建下面这些文件(Ruby On Rails 4 hello world,Ruby On Rails上手)

  create  app/controllers/welcome_controller.rbroute  get "welcome/index"invoke  erbcreate    app/views/welcomecreate    app/views/welcome/index.html.erbinvoke  test_unitcreate    test/controllers/welcome_controller_test.rbinvoke  helpercreate    app/helpers/welcome_helper.rbinvoke    test_unitcreate      test/helpers/welcome_helper_test.rbinvoke  assetsinvoke    coffeecreate      app/assets/javascripts/welcome.js.coffeeinvoke    scsscreate      app/assets/stylesheets/welcome.css.scss

在config/routes.rb添加默认页面

root 'welcome#index'

再运行

 rails server

就会出现

Welcome#indexFind me in app/views/welcome/index.html.erb

一切来得很快，很突然

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